Anti-eccentric-wear shield cutter

Abstract

The utility model provides an anti-eccentric-wear shield cutter, and relates to the technical field of shield tunneling machine cutters. The cutter body is rotationally arranged on the outer side of the cutter shaft in a sleeving mode through a bearing, and a cutter ring is arranged on the cutter body; the number of the end covers is two, and the two end covers are fixedly arranged on the cutter shaft in a sleeving mode and located at the two ends of the cutter body correspondingly; the sealing element is arranged at the end part of the end cover and can slide along the axial direction of the cutter shaft; and the elastic piece is arranged on the end cover and acts on the sealing piece, so that the sealing piece is pressed against the end part of the cutter body. When the anti-eccentric-wear shield cutter works, under the elastic force effect of the elastic piece, the sealing piece is pressed to abut against the end of the cutter body, and therefore it is guaranteed that after the anti-eccentric-wear shield cutter works for a long time, the sealing piece still has the good sealing effect, the reduction of the sealing performance is delayed, and the service life of the cutter is prolonged. And the eccentric wear phenomenon of the cutter ring caused by the fact that sundries such as muck, cooling liquid and cement grout permeate into the bearing is prevented.

Description

Technical Field

[0001] The present application relates to the technical field of shield machine cutters, and in particular to a shield machine cutter that is resistant to eccentric wear. Background Art

[0002] Shield machines are increasingly used in major projects such as urban subways, railway and highway transportation, energy transportation, underground passages, etc. They have the advantages of fast excavation speed, high construction quality, low labor intensity, economy, and environmental protection. The cutterhead is the core component of the shield machine, and the cutter is the specific executive element of the excavation, which is equivalent to the teeth of the shield machine and is the main component to realize the excavation function of the shield machine. Shield machine cutters can generally be divided into roller cutters, scrapers, cutters, leading cutters, and protective cutters. During the use of the roller cutter, when the seal of the cutter bearing retaining ring fails, it will cause debris such as ballast, coolant, and even cement slurry to penetrate into the bearing, making the bearing unable to operate effectively, that is, blocking, thereby causing eccentric wear of the roller cutter ring.

[0003] In order to solve the above technical problems, the utility model with publication number CN218206690U discloses a single-edged roller cutter for a shield machine, which includes a cutter hub, an upper end cover is arranged at the upper end of the cutter hub, a lower end cover is arranged at the lower end of the cutter hub, and a cutter shaft is penetrated through the middle of the upper end cover and the lower end cover. By providing a first sealing ring and a second sealing ring, the connection between the upper end cover and the cutter shaft and the lower end cover and the cutter shaft are sealed respectively. By providing a third sealing ring and a fourth sealing ring, the connection between the upper end cover and the cutter hub and the lower end cover and the cutter hub are sealed respectively, so as to prevent lubricating oil leakage, and debris such as ballast, coolant and even cement slurry from penetrating into the cutter to damage the bearing, thereby avoiding the phenomenon of cutter ring blocking and eccentric wear.

[0004] However, when the hob is working, the cutter hub is in a rotating state relative to the upper end cover and the lower end cover, which will cause wear to the third sealing ring and the fourth sealing ring. Therefore, after the hob is used for a long time, the wear of the third sealing ring and the fourth sealing ring increases, resulting in a decrease in sealing performance, causing debris such as ballast, coolant and cement slurry to penetrate into the bearing, causing eccentric wear of the cutter ring. Utility Model Content

[0005] The purpose of the present application is to provide a shield cutter that is anti-eccentric wear, which is used to solve the problem in the related art that after long-term use of a single-edged roller cutter for a shield machine, the wear of the sealing ring increases, resulting in a decrease in sealing performance and causing eccentric wear of the cutter ring.

[0006] The present application provides a shield tool for preventing eccentric wear, which adopts the following technical solution:

[0007] A shield tool for preventing eccentric wear, comprising:

[0008] Knife shaft;

[0009] A knife body, the knife body is rotatably sleeved on the outer side of the knife shaft through a bearing, and a knife ring is provided on the knife body;

[0010] An end cover, wherein two end covers are provided, and the two end covers are fixedly sleeved on the knife shaft and are respectively located at two ends of the knife body;

[0011] A sealing member, which is disposed at the end of the end cover and can slide along the axial direction of the knife shaft;

[0012] An elastic member is arranged on the end cover, and acts on the sealing member so that the sealing member is pressed against the end of the blade body.

[0013] Optionally, the blade body includes a blade hub, an end plate and a sealing gasket. The blade hub is rotatably mounted on the outside of the blade shaft through a bearing. The end plates are provided with two pieces. The two end plates are fixedly connected to both ends of the blade hub. The sealing gasket is arranged between the end of the blade hub and the end plate. The sealing member can abut against the end surface of the end plate. The blade ring is located on the periphery of the blade hub.

[0014] Optionally, it also includes a sealing ring and an annular seat, wherein an annular groove is provided at the end of the end cover, the annular seat is slidably arranged in the annular groove, the sealing member is fixedly arranged at the end of the annular seat, the sealing ring is arranged at the outer periphery of the annular seat and contacts the side wall of the annular groove.

[0015] Optionally, the elastic member is disposed in the annular groove of the end cover, and the elastic member is used to push the annular seat to move in a direction toward one side of the annular groove opening.

[0016] Optionally, a sliding column is provided on the annular seat, and a guide hole penetrating the annular groove is provided on the end cover, and the sliding column is slidably inserted in the guide hole.

[0017] Optionally, the elastic member is a spring, the spring is sleeved on the outside of the sliding column, and two ends of the spring are respectively in contact with the inner end surface of the annular groove and the end surface of the annular seat.

[0018] Optionally, the outer periphery of the knife ring is provided with protrusions evenly distributed along the circumferential direction.

[0019] Optionally, it also includes a connecting bolt, the sealing gasket is provided with a through hole, the cutter hub is provided with a screw hole, the end plate is provided with a connecting hole, the connecting bolt passes through the connecting hole and the through hole, and is screwed to the cutter hub through the screw hole.

[0020] To summarize, the present application includes at least one of the following beneficial technical effects: when the anti-eccentric wear shield cutter of the present application is working, the seal is pressed against the end of the cutter body under the elastic force of the elastic part. Therefore, when the cutter body rotates and the end face of the cutter body is in friction contact with the seal, causing the seal to be worn, the seal can always be in good contact with the end face of the cutter body under the elastic force of the elastic part, thereby ensuring that the seal of the anti-eccentric wear shield cutter of the present application still has a good sealing effect after long-term work, thereby delaying the decline in sealing performance and preventing the eccentric wear of the cutter ring caused by the infiltration of debris such as ballast, coolant and cement slurry into the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a shield tool for preventing eccentric wear in an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of a shield tool for preventing eccentric wear in an embodiment of the present application;

[0023] Figure 3 for Figure 2 A partial enlarged schematic diagram of part A.

[0024] Description of reference numerals:

[0025] 10. knife shaft; 11. first limiting portion; 12. second limiting portion;

[0026] 20. knife body; 21. knife hub; 211. screw hole; 212. slot; 22. end plate; 221. connecting hole; 23. sealing gasket; 231. through hole; 24. knife ring; 241. raised part;

[0027] 30. Bearing; 31. Inner ring; 32. Outer ring;

[0028] 40. end cover; 41. annular groove; 42. guide hole; 43. limiting boss;

[0029] 50. Rubber pad; 60. Spring; 70. Sealing ring;

[0030] 80. annular seat; 81. sliding column; 82. mounting groove;

[0031] 90. Connecting bolt; 100. Circlip. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1 -Attached Figure 3 , further details of this application are given.

[0033] The embodiment of the present application discloses a shield tool that prevents eccentric wear.

[0034] Reference Figures 1 to 3A shield tool for preventing eccentric wear includes a cutter shaft 10, a cutter body 20, an end cover 40, a seal, an elastic member, a connecting bolt 90, a retaining spring 100, a sealing ring 70 and an annular seat 80. The cutter body 20 is rotatably sleeved on the outer side of the cutter shaft 10 through a bearing 30. Two end covers 40 are provided. The two end covers 40 can be fixedly sleeved on the cutter shaft 10 by welding or the like, and are respectively located at both ends of the cutter body 20. In an optional embodiment, the specific structure of the cutter body 20 and the specific connection relationship with the cutter shaft 10 are as follows:

[0035] The blade body 20 includes a blade hub 21, an end plate 22 and a sealing gasket 23. The blade hub 21 is rotatably sleeved on the outside of the blade shaft 10 through a bearing 30. The end plate 22 is provided with two pieces, and the two end plates 22 are fixedly connected to the two ends of the blade hub 21. The sealing gasket 23 is provided between the end of the blade hub 21 and the end plate 22. More specifically, a through hole 231 is provided on the sealing gasket 23, a screw hole 211 is provided on the blade hub 21, and a connecting hole 221 is provided on the end plate 22. The connecting bolt 90 is passed through the connecting hole 221 and the through hole 231, and is screwed to the blade hub 21 through the screw hole 211.

[0036] The bearing 30 can be a tapered roller bearing, and two groups are provided. The two groups of bearings 30 are sleeved on the knife shaft 10. A groove 212 is provided on the inner wall of the knife hub 21. The retaining spring 100 is clamped in the groove 212. The retaining spring 100 abuts against one end of the outer ring 32 of the bearing 30. A limiting boss 43 is provided on the end cover 40. The limiting boss 43 abuts against one end of the inner ring 31 of the bearing 30. A first limiting portion 11 and a second limiting portion 12 are provided on the knife shaft 10. The first limiting portion 11 abuts against the other end of the inner ring 31 of the bearing 30, and the second limiting portion 12 abuts against the other end of the outer ring 32 of the bearing 30.

[0037] Reference Figure 2 and Figure 3 , the sealing member is arranged at the end of the end cover 40 and can slide along the axial direction of the blade shaft 10. In an optional embodiment, the specific connection relationship between the sealing member and the end cover 40 is as follows: the end of the end cover 40 is provided with an annular groove 41, the annular seat 80 is slidably arranged in the annular groove 41, the annular seat 80 is provided with a slide post 81, the end cover 40 is provided with a guide hole 42 that passes through the annular groove 41, and the slide post 81 is slidably inserted in the guide hole 42. The sealing member is fixedly arranged at the end of the annular seat 80, and the sealing member can abut against the end surface of the end plate 22. The sealing ring 70 is arranged at the outer periphery of the annular seat 80. More specifically, the outer periphery of the annular seat 80 is provided with an installation groove 82, the sealing ring 70 is clamped in the installation groove 82, and the sealing ring 70 contacts the side wall of the annular groove 41. The sealing member can be a rubber pad 50.

[0038] Reference Figure 2 and Figure 3The elastic member is arranged on the end cover 40. More specifically, the elastic member is arranged in the annular groove 41 of the end cover 40. The elastic member can be a spring 60. Furthermore, the spring 60 is sleeved on the outside of the sliding column 81. The two ends of the spring 60 are respectively in contact with the inner end surface of the annular groove 41 and the end surface of the annular seat 80.

[0039] The elastic member acts on the seal so that the seal pressure abuts against the end of the blade body 20 . More specifically, the elastic member is used to push the annular seat 80 toward the opening of the annular groove 41 so that the seal pressure abuts against the end surface of the end plate 22 .

[0040] Reference Figure 1 and Figure 2 The cutter body 20 is provided with a cutter ring 24, which is located at the periphery of the cutter hub 21. The outer periphery of the cutter ring 24 is provided with protrusions 241 evenly distributed along the circumferential direction.

[0041] The implementation principle of the shield cutter with anti-eccentric wear in this embodiment is as follows: when the shield cutter with anti-eccentric wear in this application is in use, the cutter shaft 10 is fixedly mounted on the cutter head of the shield machine. When the shield cutter with anti-eccentric wear in this application is in operation, the cutter body 20 can rotate relative to the cutter shaft 10. When the cutter body 20 rotates, the seal member presses against the end surface of the end plate 22, and the seal ring 70 contacts the side wall of the annular groove 41, thereby sealing the inside of the cutter body 20 to prevent debris, coolant, and even cement slurry from penetrating into the bearing 30.

[0042] When the shield cutter with anti-eccentric wear of the present application is working, the seal is pressed against the end face of the end plate 22 under the elastic force of the elastic member. Therefore, when the cutter body 20 rotates to make the end face of the end plate 22 contact with the seal by friction, causing the seal to be worn, the seal can always be in good contact with the end face of the end plate 22 under the elastic force of the elastic member, thereby ensuring the sealing effect. When the seal is worn, the elastic force of the elastic member pushes the annular seat 80 and the seal to move along the axial direction of the cutter shaft 10. Since the moving distance is short, the friction between the sealing ring 70 and the side wall of the annular groove 41 is small, thereby ensuring that the sealing ring 70 has a good sealing effect, thereby ensuring that the shield cutter with anti-eccentric wear of the present application has a good sealing effect after long-term operation, thereby delaying the decline of the sealing performance and preventing the eccentric wear of the cutter ring 24 caused by the infiltration of debris such as ballast, coolant and cement slurry into the bearing 30.

[0043] The blade body 20 of the anti-biased wear shield tool of the present application is composed of a blade hub 21, an end plate 22 and a sealing gasket 23. The end face of the end plate 22 is annular, and the width of the annular end plate 22 is greater than the width of the blade hub 21. Accordingly, the width of the seal can be set to match the width of the end plate 22, so that the width of the seal can be set wider, thereby increasing the sealing contact area and improving the sealing effect.

[0044] Since the seal is pressed against the end face of the end plate 22 under the elastic force of the elastic member, the friction force when the cutter body 20 rotates is increased. Therefore, a protrusion 241 evenly distributed along the circumferential direction is provided on the outer periphery of the cutter ring 24 to increase the reaction torque of the cutter ring 24 from the cut rock wall when the cutter ring 24 rotates, thereby preventing the cutter body 20 from failing to rotate.

[0045] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shield tool for preventing eccentric wear, characterized in that: include: A knife shaft (10); A knife body (20), wherein the knife body (20) is rotatably sleeved on the outside of the knife shaft (10) via a bearing (30), and a knife ring (24) is provided on the knife body (20); An end cover (40), wherein two end covers (40) are provided, and the two end covers (40) are fixedly sleeved on the knife shaft (10) and are respectively located at two ends of the knife body (20); A sealing member, the sealing member being arranged at an end of the end cover (40) and being able to slide along the axial direction of the knife shaft (10); An elastic member is arranged on the end cover (40), and the elastic member acts on the sealing member so that the sealing member is pressed against the end of the blade body (20).

2. The shield tool for preventing eccentric wear according to claim 1, characterized in that: The blade body (20) comprises a blade hub (21), an end plate (22) and a sealing gasket (23); the blade hub (21) is rotatably sleeved on the outer side of the blade shaft (10) via a bearing (30); the end plate (22) is provided with two pieces, and the two end plates (22) are fixedly connected to the two ends of the blade hub (21); the sealing gasket (23) is arranged between the end of the blade hub (21) and the end plate (22); the sealing member can abut against the end surface of the end plate (22); and the blade ring (24) is located on the periphery of the blade hub (21).

3. The shield tool for preventing eccentric wear according to claim 2, characterized in that: It also includes a sealing ring (70) and an annular seat (80), wherein an annular groove (41) is provided at the end of the end cover (40), the annular seat (80) is slidably arranged in the annular groove (41), the sealing member is fixedly arranged at the end of the annular seat (80), and the sealing ring (70) is arranged at the outer periphery of the annular seat (80) and contacts the side wall of the annular groove (41).

4. The shield tool for preventing eccentric wear according to claim 3, characterized in that: The elastic member is disposed in the annular groove (41) of the end cover (40), and is used to push the annular seat (80) to move in the direction of the opening side of the annular groove (41).

5. The shield tool for preventing eccentric wear according to claim 3, characterized in that: The annular seat (80) is provided with a slide post (81), the end cover (40) is provided with a guide hole (42) which is in communication with the annular groove (41), and the slide post (81) is slidably inserted in the guide hole (42).

6. The shield tool for preventing eccentric wear according to claim 5, characterized in that: The elastic member is a spring (60), which is sleeved on the outside of the sliding column (81), and the two ends of the spring (60) are respectively in contact with the inner end surface of the annular groove (41) and the end surface of the annular seat (80).

7. The shield tool for preventing eccentric wear according to claim 1, characterized in that: The outer periphery of the knife ring (24) is provided with raised portions (241) evenly distributed along the circumferential direction.

8. The shield tool for preventing eccentric wear according to claim 2, characterized in that: The invention also comprises a connecting bolt (90), the sealing gasket (23) is provided with a through hole (231), the blade hub (21) is provided with a screw hole (211), the end plate (22) is provided with a connecting hole (221), the connecting bolt (90) is passed through the connecting hole (221) and the through hole (231), and is screwed to the blade hub (21) through the screw hole (211).

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